Sonoma County, CA Animal Ordinances: Microchipping (2026)
Key Facts
- Trigger
- Potentially dangerous or vicious designation
- Requirement
- Microchip implanted by the division
- Also required
- Sterilization at owner's expense
- Cost
- Owner pays for both
- General pets
- No countywide microchip mandate
Summary
Sonoma County doesn't require microchips for ordinary pets, but any animal formally found potentially dangerous or vicious must be microchipped and sterilized at the owner's expense.
The owner of any animal found potentially dangerous or vicious pursuant to this chapter shall, at his or her expense, have a microchip assigned by the division, implanted into the animal for identification purposes. The identifying information listed on the microchip shall be noted in the licensing files for that animal. An animal that has been found to be potentially dangerous or vicious pursuant to this chapter shall be sterilized at the owner's expense.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 64 Update 2).
Full Breakdown
Unincorporated Sonoma County has no general pet-microchipping mandate: routine dog and cat owners only need the standard rabies vaccination and license. The requirement kicks in once an animal is adjudicated potentially dangerous or vicious under the county's dangerous-animal hearing process: the owner must then have Animal Services implant a microchip for identification, with the chip's ID recorded in the animal's licensing file, and must also have the animal sterilized, both at the owner's cost. This applies countywide to unincorporated areas; incorporated cities inside the county, including Santa Rosa, Petaluma, Rohnert Park, Windsor, Healdsburg, Sebastopol, Cotati, Cloverdale, and the City of Sonoma, enforce their own municipal codes instead.
Violations & Fines
Noncompliance is enforced through the same dangerous/vicious animal proceeding: the director can deny reinstatement of the animal's registration or pursue further impoundment until the microchip and sterilization are completed.
Frequently Asked Questions
Does Sonoma County require microchipping all dogs and cats?
Who pays for the microchip and sterilization?
Sources & Official References
Other rules in Sonoma County
California rules heatmap·Compare Sonoma County to another location·View the California animal ordinances overview
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